Can a ground wire be added to a fire-resistant cable tray

Yes, a ground wire can be added to a fire-resistant cable tray, but it must be installed using proper bonding methods and compatible materials to maintain both electrical safety and fire-resistance integrity.Grounding Practices for Cable TraysA cable tray, including those supporting fire-resistant cables, can be bonded to an equipment grounding conductor (EGC) using grounding clamps. This ensures that under fault conditions, the EGC remains securely connected and prevents electrical hazards caused by magnetic forces displacing the conductor . For aluminum trays, a bare copper wire should be avoided due to potential electrolytic corrosion; instead, an insulated conductor with insulation removed only at bonding points is recommended . Steel trays can also serve as a grounding path, but their use as an EGC is limited by the circuit's ground-fault protection rating .Fire-Resistant Cable ConsiderationsFire-resistant cables are designed to maintain circuit integrity during a fire, often tested for at least 1 hour of operation under UL 2196 or ASTM E119 standards . When installed in a tray, the fire-resistance rating of the cable system must not be compromised. This means that any grounding wire or clamp added should be metallic and fire-rated, ensuring it does not melt or fail during a fire . Plastic ties or non-metallic supports are insufficient for maintaining fire integrity .Practical Installation TipsUse all-metallic fixings such as steel clamps or screws to attach the ground wire to the tray .Ensure the ground wire does not interfere with the fire-resistant cable spacing or tray fill limits.Follow the manufacturer's installation instructions for both the fire-resistant cable and the tray system to maintain the tested fire rating .Verify that the grounding path provides a low-impedance connection to a system ground without compromising fire protection .SummaryAdding a ground wire to a fire-resistant cable tray is feasible and often desirable for safety, but it must be done using metallic, fire-rated components and proper bonding techniques. This ensures that the tray remains electrically safe while preserving the fire-resistance performance of the cable system .